Percentage of observations where the VFR minimums for ceiling and visibility are met: visibility of 5 mi or more and a ceiling of 3,000 ft or more. Only observations between sunrise and sunset are taken into account.
Marginal VFR conditions (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
Marginal VFR conditions or better during daylight period
Percentage of observations where the MVFR minimums for ceiling and visibility are met: visibility of 3⅛ mi or more and a ceiling of 1,000 ft or more. Only observations between sunrise and sunset are taken into account.
Maximum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-2.4
-5
0
1
3
-2
February
-2.6
7
2
2
-4
2
March
5.8
6
-1
9
12
10
April
12.2
12
10
14
13
May
19.6
23
19
20
18
June
26.9
28
22
31
27
July
30.9
29
33
33
30
August
29.2
28
32
31
30
September
24.3
22
27
27
24
October
13.9
15
17
17
10
November
7.6
10
3
11
12
December
1.8
6
-4
2
5
Average
12.7
3.1
14.0
14.1
16.3
14.8
Average highest temperature per day
The maximum temperature is typically observed some hours after noon.
Minimum temperatures (°C)
Month
Average
2024
2023
2022
2021
2020
January
-11.5
-13
-8
-12
-6
-10
February
-12.0
-5
-9
-12
-16
-9
March
-6.8
-6
-9
-6
-2
-3
April
-1.5
-1
-2
-1
-2
May
7.1
9
6
7
6
June
13.0
14
9
14
13
July
16.3
15
17
17
16
August
15.2
16
17
15
16
September
10.6
13
12
11
9
October
2.1
4
4
5
0
November
-4.1
-2
-8
-2
-3
December
-9.9
-5
-13
-9
-6
Average
0.7
-8.3
2.9
0.7
3.0
2.2
Average lowest temperature per day
The minimum temperature is typically observed just before sunrise.
Precipitation (%)
Month
Average
2024
2023
2022
2021
2020
January
0.0
0
0
0
0
0
February
0.0
0
0
0
0
0
March
0.0
0
0
0
0
0
April
0.0
0
0
0
0
May
0.0
0
0
0
0
June
0.0
0
0
0
0
July
0.0
0
0
0
0
August
0.0
0
0
0
0
September
0.0
0
0
0
0
October
0.0
0
0
0
0
November
0.0
0
0
0
0
December
0.0
0
0
0
0
Average
Precipitation during daylight period
Percentage of observations with observed rain, drizzle, snow or hail. Only observations between sunrise and sunset are taken into account.
Wind speed (knots)
Month
Average
2024
2023
2022
2021
2020
January
11.6
10
8
15
12
11
February
11.6
12
12
15
12
11
March
12.4
13
11
15
13
12
April
13.9
14
18
14
14
May
11.8
10
13
12
13
June
10.4
10
9
11
11
July
9.7
9
11
11
9
August
9.9
10
10
10
10
September
11.1
11
11
10
12
October
13.1
12
12
13
13
November
11.8
10
14
13
11
December
11.7
12
12
12
12
Average
11.6
11.9
10.7
12.8
11.8
11.5
Average wind speed
Excluding wind gusts. Only observations between sunrise and sunset are taken into account.
Prevailing wind direction
Month
2024
2023
2022
2021
2020
January
320°
282°
300°
309°
262°
February
302°
312°
308°
300°
293°
March
358°
039°
325°
300°
299°
April
330°
334°
333°
309°
May
138°
288°
118°
125°
June
114°
353°
092°
241°
July
086°
305°
130°
123°
August
024°
093°
196°
048°
September
063°
246°
253°
320°
October
335°
314°
303°
296°
November
308°
297°
298°
268°
December
284°
316°
284°
299°
Prevailing wind direction
Average wind direction, weighed by wind speed. Only observations between sunrise and sunset are taken into account.